Nashua, New Hampshire (CNN)GOP presidential hopefuls descended on New Hampshire over the weekend as part of the Republican Leadership Summit, a two-day event that drew about 500 activists and the party's entire 2016 field to the Crowne Plaza Hotel in Nashua.

The event's speakers ranged from party front-runners to little-known candidates, all of whom offered up criticisms of President Barack Obama, espoused conservative principles and sought to distinguish themselves from the rest of the GOP pack.

Scott Walker: The Wisconsin governor loved to talk about Kohl's. His tax theory was the "Kohl's curve." His attack on Hillary Clinton's aloofness was that she's probably never shopped at Kohl's. His suit came from Jos. A. Bank, but the shirt? That was from Kohl's. And probably purchased with coupons he pulled out of the newspaper.

For Walker, it was his way of emphasizing his penny-pinching conservative ways, as well as the value of a dollar for an up-and-coming family.

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Walker talked of working at McDonald's (at the same time Rep. Paul Ryan worked at another McDonald's down the road). He said his first job was at a countryside restaurant, washing dishes.

Then Walker transitioned into a riff on the American dream—and how Republicans should measure their success by the number of citizens they are able to shift off welfare programs.

"It comes from empowering people to live their own lives and their own destinies with the dignity that is borne of work," Walker said.

He added: "In America, you can do and be anything that you want. The opportunity is open to all. But the outcome should be up to each and every one of us."

Walker also promised to "bring the fight to them" when it comes to the threat posed by the Islamic State in Iraq and Syria. He said Clinton is "really an extension of the third term of Barack Obama ... and we've got a real choice out there."

Ted Cruz: The most fiery comments of the day came from the Texas senator, who laid into President Obama's handling of immigration and foreign threats.

The Obama administration is so bad, he told the all-Republican crowd, that the final 20 months of its second term will be "like Lord of the Flies."

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"If only the terrorists attacked a golf course," Cruz said, taking a long pause, "that might actually get the White House's attention."

He said he won't vote for Obama's nominee for attorney general, Loretta Lynch, drawing applause.

Cruz also praised New Hampshire Sen. Kelly Ayotte, who, like Cruz, was among the 47 Senate Republicans who signed a letter to Iran's leader warning that the nuclear deal negotiated by the United States and five other world powers might not survive Obama's presidency. He also mocked Democrats who have called that letter a political vulnerability for its signers, and said his only regret is that, like John Hancock, he didn't sign his name larger.

Mike Huckabee: Introduced as "the real hope from Arkansas"—a play on the hometown of Hope that he and Bill Clinton share—the former Arkansas governor talked about running against "the Clinton machine."

Huckabee said he opposed a Clinton himself or a candidate for whom the Democratic family was campaigning in nearly every run for office he's made.

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"If somebody wants to know what is it like running against their organization and their apparatus, come see me. ... I've got some scars," he said.

Huckabee offered red meat, hitting President Obama's executive actions on immigration, and added that "I want the Republican Party to start acting like the Republican Party."

He called for term limits for both Congress and judges, compared challenges the United States faces in the Middle East, particularly Iran, to "a viper that will bite us," and called for a "fair tax" that would replace all others with a national consumption tax on retail sales. He also railed against the IRS, which he said has become "a criminal enterprise, and we need to get rid of it."

John Kasich: The Ohio governor who's weighing a dark-horse bid for the White House sought to leverage his more than three decades as a player in Republican politics as he offered what he described as a message of unity.

He started from the beginning: 1982, when President Ronald Reagan's popularity was flagging, but Kasich embraced the Republican president during his first run for Congress.

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Kasich climbed the ranks in Congress, eventually becoming the House Budget Committee chairman, where he helped negotiate a 1997 budget that put the United States on track for a major surplus.

After leaving the House, he eventually ran for Ohio governor and was elected twice, winning a second term in 2014 with nearly 64% of the vote in the "swingiest of swing states," he said.

"So what's the lesson of leadership? No polls, no focus groups, no consultants in the back telling you what to say. None of that. You, as a leader, need to know what you're for," he said.

Lindsey Graham: Warning that "9/11 is coming again" if the United States doesn't combat the rising threat of terrorism, Graham called for new U.S. military action in the Middle East.

"You know how you defeat radical Islam? You go over there and you fight them so they don't come here," he said.

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Graham was self-deprecating, joking about having gone to law school ("nobody's perfect"), his pay as a senator ("I'm not saying I'm worth it, but it's what I make"), and the reality, in his view, that any of the Republican presidential contenders are a better option than Hillary Clinton.

"She's a third term of Barack Obama," Graham said. "She's the architect of this foreign policy. Bill and Hillary did a better job selling Obamacare than he did."

Graham was heavy on a hardscrabble personal biography, and said he supports means-testing for entitlement programs like Social Security. And he defended his push for immigration reform legislation.

"I was not born with a silver spoon in my mouth. I have been knocked down like a lot of people in this country. I have tried to work with Democrats when it made sense to me," he said.

Donald Trump: Virtually no one believes he'll actually run for president, but Trump tried his best to convince the audience that this time, he's serious about it.

"If I decide to run—and I think I'm gonna surprise a lot of people, a lot of people ... I will make this country great again," Trump said.

During his speech, Trump pitched his own book, and told the audience he wasn't really enjoying himself.

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"I'm not having a great time. I can think of other things, many other things, where I can have a good time," he said.

But he said he's considering a presidential run because U.S. trade negotiations and diplomatic efforts are being handled by "babies that don't have a clue," and said he'd hire "all the killers on Wall Street" to work in his administration.

Bobby Jindal: The Louisiana governor threw his support behind President Obama's efforts to negotiate massive free trade pacts with Pacific Rim countries and the European Union, but added one condition: "We need to make sure the administration actually gets it right."

Jindal said the United States' biggest long-term threat is the rise of China, and said trade could be a key way to make sure the United States doesn't "cede that sphere of influence to China."

The comment came in an answer to a question about U.S. sovereignty during remarks that were otherwise heavily focused on Jindal's personal biography—particularly his father's work ethic.

He also hammered the issue of educational choice, saying he wants to shrink the size of the federal Department of Education and end states' reliance on Common Core.

Carly Fiorina: The former Hewlett-Packard executive rebuked a Dallas businesswoman's comment that only men should be elected president because of women's hormones, and in doing so, took a shot at Bill Clinton's White House affair with Monica Lewinsky.

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"Not that we have seen a man's judgment clouded by hormones, including in the Oval Office," Fiorina said sarcastically, drawing laughs and applause.

The comment was a high point in a speech and question-and-answer session that focused almost entirely on Fiorina's view of leadership, rather than her take on specific issues.

"Wherever there are problems, there are people who know how to solve them, but they need to be asked," she said.

Rand Paul: The Kentucky senator launched the toughest set of broadsides yet against Democratic front-runner Hillary Clinton yet, chiding her over Benghazi, her private email server and her family foundation's foreign donations.

"When Hillary Clinton travels, there's going to need to be two planes: One for her and her entourage, and one for her baggage," Paul told the crowd.

He earned his biggest applause as he laid into Clinton for failing to do enough to secure the U.S. Embassy in Libya, saying that "her dereliction of duty, not doing the job, not providing security, should preclude her from ever holding higher office."

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On Clinton's use of a private email address on a home server, which she has asserted was protected by the Secret Service, Paul said: "Does she think there's, like, floppy disks in her basement?"

And on the Clinton Foundation, which is under fire for accepting donations from foreign leaders, Paul suggested the controversy won't die down soon, promising that "there's more to come."

Clinton wasn't Paul's only target. He criticized the U.S. military intervention in Libya, saying the country should never have waded into the conflict there in the first place and that his rival Republican White House hopefuls "would have done the same thing, just 10 times over."

The rest of his speech was focused on individual liberty. Paul said national surveillance programs are violating Americans' rights, and also blasted police use of civil forfeiture laws and slow trials.

"Everything goes right for the high school quarterback. Everything goes right for the prom queen," he said. "The Bill of Rights is for the least among us."

Marco Rubio: The first-term Florida senator went for the heartstrings in his speech Friday night, framing his comments on foreign policy, the economy and entitlement reforms around his parents and his children.

The son of Cuban immigrants, Rubio posited 2016 as a "referendum on our national identity," saying that his children and their generation would be "the first to inherit a diminished country from their parents."

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Calling for an overhaul of Medicare and Social Security, Rubio said he wants to make sure the changes don't "impact anyone like my mother—people who are currently in the program or about to retire."

But he told a University of New Hampshire student that reforms like a higher retirement age "will require my generation and your generation to accept that ... it's going to look different than our parents' Social Security and their Medicare."

Jeb Bush: The former Florida governor tried again to separate himself from his family—particularly important in this state, which didn't help his father or brother become president—and tried to strike a positive tone overall during his speech Friday afternoon.

"We will not win if we just complain about how bad things are," Bush said. "We also have to offer a compelling alternative so that more and more and more people join our cause."

To a question on same-sex marriage, Bush asserted that he is "for traditional marriage" but that he has "no hatred or bitterness in my heart for people who have a different view," and said that issue shouldn't distract from a campaign that should be about economic growth and a tougher foreign policy.

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"I mean, come on," he said. "What are you seeing that I'm not seeing?"

Bush touted his record during eight years as Florida's top executive, saying that it's an "I'm-not-kidding conservative one."

Chris Christie: Just days after unveiling a raft of reforms to entitlement programs like Medicare and Social Security, the New Jersey governor said his willingness to wade into such politically challenging issues underscores his biggest selling point: that he's a truth-teller.

"There is no political advantage to talking about those issues," Christie said. "The reason you talk about them is because you want to really make suggestions that will help solve the problems that our country confronts."

He touted his five vetoes of tax increases sent to his desk by New Jersey's Democratic-led legislature, and said he balanced a state budget that was in an $11 billion deficit when he took office. He also lambasted Obama, saying he only cares about two Ls: "legacy and library."

"I'm not looking to be the most popular guy in the world. I'm looking to be the most respectable," Christie said.

He said entitlement programs are bankrupting the country, swallowing up 71% of federal spending today versus 26% five decades ago.

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Christie called for Social Security benefits to be eliminated for Americans earning more than $200,000 in annual retirement income. In speeches this week, he's also proposed a means test for those whose retirement income tops $80,000—with similar means testing for Medicare, with those with high retirement income paying a larger share of their premiums. He also suggested raising the eligibility age to 69 for both programs, though those changes would be phased in slowly.

"There are ways that we can put our fiscal house in order in this country, and we need to, and everybody who's considering running for President of the United States should have to answer to you" about how they'll reform Social Security, Medicare and Medicaid, Christie said.

Rick Perry: The former Texas governor told the crowd he's in much better physical shape and much wiser on the issues as he considers a second run for the presidency—this time, from the back of the pack, rather than from the front-runner status he enjoyed in the late summer of 2011.

Perry, 65, acknowledged that his major back surgery that year, just weeks before he launched his presidential campaign, hurt his preparation.

"To be prepared, to stand on the stage and talk about this myriad of issues, whether it's domestic policy, monetary policy or foreign policy, it takes years of intense studies," Perry said. "I spent the last three years in that mode—being able to stand up and discuss all of these issues and do it in a way that is very profound and impactful."

He played up his 14 years in the governor's office of the nation's largest Republican-voting state, offering it as a contrast to both President Barack Obama's four years in the Senate and the three first-term Republican senators who have entered the race so far: Rubio, Paul and Cruz. And Perry said that "change is only going to come from the outside."

"We've spent eight years with a young, inexperienced United States senator. Economically, militarily and foreign policy-wise, we're paying a heavy price," Perry said.

"They didn't hand me a manual to say, 'Here's how you deal with a space shuttle disintegrating in your state,'" he said. "They didn't hand me a manual when Katrina came into Louisiana, and there were literally hundreds of thousands of people that were displaced. They didn't hand me a manual when all of those people showed up at our border last year, or, for that matter, when Ebola ended up on the shores of America in Dallas, Texas."

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Former Florida Gov. Jeb Bush has said his decision to run for the Republican nomination will be based on two things: his family and whether he can lift America's spirit. His father and brother are former Presidents.

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Wisconsin Gov. Scott Walker has created a political committee that will help him travel and raise money while he considers a 2016 bid. Additionally, billionaire businessman David Koch said in a private gathering in Manhattan this month that he wants Walker to be the next president, but he doesn't plan to back anyone in the primaries.

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Louisiana Gov. Bobby Jindal is establishing a committee to formally explore a White House bid. "If I run, my candidacy will be based on the idea that the American people are ready to try a dramatically different direction," he said in a news release provided to CNN on Monday, May 18.

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Sen. Bernie Sanders, an independent from Vermont who caucuses with Democrats, has said the United States needs a "political revolution" of working-class Americans looking to take back control of the government from billionaires. He first announced the run in an email to supporters early on the morning of Thursday, April 30.

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On March 2, retired neurosurgeon Ben Carson announced the launch of an exploratory committee. The move will allow him to raise money that could eventually be transferred to an official presidential campaign and indicates he is on track with stated plans to formally announce a bid in May.

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South Carolina Sen. Lindsey Graham has said he'll make a decision about a presidential run sometime soon. A potential bid could focus on Graham's foreign policy stance.

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Hillary Clinton launched her presidential bid Sunday, April 12, through a video message on social media. She continues to be considered the overwhelming front-runner among possible 2016 Democratic presidential candidates.

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Sen. Marco Rubio announced his bid for the 2016 presidency on Monday, April 13, a day after Hillary Clinton, with a rally in Florida. He's a Republican rising star from Florida who swept into office in 2010 on the back of tea party fervor. But his support of comprehensive immigration reform, which passed the Senate but has stalled in the House, has led some in his party to sour on his prospects.

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Lincoln Chafee, a Republican-turned-independent-turned-Democrat former governor and senator of Rhode Island, said he's running for president on Thursday, April 16, as a Democrat, but his spokeswoman said the campaign is still in the presidential exploratory committee stages.

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Jim Webb, the former Democratic senator from Virginia, is entertaining a 2016 presidential run. In January, he told NPR that his party has not focused on white, working-class voters in past elections.

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Vice President Joe Biden has twice before made unsuccessful bids for the Oval Office -- in 1988 and 2008. A former senator known for his foreign policy and national security expertise, Biden made the rounds on the morning shows recently and said he thinks he'd "make a good President."

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New Jersey Gov. Chris Christie has started a series of town halls in New Hampshire to test the presidential waters, becoming more comfortable talking about national issues and staking out positions on hot topic debates.

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Rep. Paul Ryan, a former 2012 vice presidential candidate and fiscally conservative budget hawk, says he's keeping his "options open" for a possible presidential run but is not focused on it.

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Sen. Rand Paul officially announced his presidential bid on Tuesday, April 7, at a rally in Louisville, Kentucky. The tea party favorite probably will have to address previous controversies that include comments on civil rights, a plagiarism allegation and his assertion that the top NSA official lied to Congress about surveillance.

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Texas Sen. Ted Cruz announced his 2016 presidential bid on Monday, March 23, in a speech at Liberty University. The first-term Republican and tea party darling is considered a gifted orator and smart politician. He is best known in the Senate for his marathon filibuster over defunding Obamacare.

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Democrat Martin O'Malley, the former Maryland governor, released a "buzzy" political video in November 2013 in tandem with visits to New Hampshire. He also headlined a Democratic Party event in South Carolina, which holds the first Southern primary.

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Republican Rick Perry, the former Texas governor, announced in 2013 that he would not be seeking re-election, leading to speculation that he might mount a second White House bid.

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Former Pennsylvania Sen. Rick Santorum, a social conservative, gave Mitt Romney his toughest challenge in the nomination fight last time out and has made trips recently to early voting states, including Iowa and South Carolina.

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Political observers expect New York Gov. Andrew Cuomo to yield to Hillary Clinton's run in 2016, fearing there wouldn't be room in the race for two Democrats from the Empire State.